Aug. 19, 2024
LED COB light, with COB standing for &#;Chip-on-Board&#;, is a type of LED which consists of an array of LED chips mounted on a substrate such as silicon carbide. It features compactness, energy efficiency and outstanding uniformity of brightness, which makes it gain popularity from photographers and filmmakers.
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1. Homogeneous luminosity
Compared to other LED, COB light produces excellent uniformity of light. The beam it sends out is concentrated and clean. If it is used to create some special shadow effect, the outline of the shadow will be more distinct than that of other LED.
2. Compactness
COB chip LED light consists of multiple diodes which are mounted on a single substrate. The gap between each diode is narrow. Such design reduces the volume of it and makes it convenient to be utilized for various applications.
3. Energy efficiency
Compared with other types of LED, COB LED light has greater energy efficiency that it has a brighter light output but consumes less energy.
1. Durable
The thermal resistance of COB LED is low, which guarantees conductivity, reliability and life span. Because the LED chips are directly mounted on the substrate, spot welding is unnecessary, which means, the failure rate of the light is reduced. In general, the design make it durable.
2. Good lighting effect
Composed of mounted LED chips, COB LED array appears as a single light source. It offers high intensity and homogeneous luminosity. Comparing with other types of LED, the homogeneous luminosity of it is remarkable. For those who require high standard lighting effect, LED COB light is a great option.
3. Energy-saving
Compared with other LED, LED COB light consumes less energy when sending out same lumens of brightness.
4. Space-saving
The circuit configuration of cob package effectively saves spaces.
5. Simple installation
LED chip on board have only one circuit and two contacts for the whole chip. Thus, the installation of it is convenient.
Although LED COB light performs well in homogeneous luminosity and energy efficiency, it has a considerable shortage that its heat dissipation is an issue. Because all of the light&#;s LED chips converge on a single substrate, it generates a lot of heat when providing powerful lighting. If the heat accumulates constantly, it will take a toll on the light&#;s running status. Besides, active cooling may make a noise, which be an issue for filmmakers who need to record sound. Therefore, to guarantee the smooth operation and reduce the breakdown, an excellent heat sink is needed when the light is working.
COB LED light source is appropriate for various outdoor and indoor lighting applications. It can be applied for universal illumination in industrial, residential, architectural and others. For instance, it can be used as street light, spot light, and strip light. The homogeneous luminosity of it enables it to play a crucial role in filmmaking and photographing.
1. Flexibility
The compactness of chip on board LED array provides ease for utilizing it in different places. The traditional DIP light is cheap but bulky. Compared to DIP light, it is more portable and flexible for outdoor applications.
2. Outstanding light effect
The high intensity and homogeneous luminosity of chip on board can provide users good experience. It meets the need of high standard lighting applications.
3. Simplified installation
COB LED light panel requires only one circuit and two contacts for the whole chip while SMD light requires one circuit for each diode contained in the chip. Such circuit configuration enables it to be installed without striking a blowing.
To choose a LED video light panel like COB LED panel, here are some of the factors you need to care about.
After sifting through my posts, I realized that I&#;ve neglected to write something that&#;s a little more suitable for somebody who&#;s brand spankin&#; new to the world of LED COBs. This guide will serve as a short introduction to the basic elements of COB LED lighting systems, and is a good place to start if you&#;re looking to make the switch from other types of lighting, or if you&#;re new to indoor gardening altogether.
COB LED systems are actually quite simple &#; there are only a handful of different parts, and they all go together pretty easily. The main components of a COB LED system are:
Not so bad, right? Let&#;s delve a little further in.
The main component of a COB LED lighting system would obviously be the lights themselves. The term COB stands for &#;Chip On Board&#;, and refers to the fact that each unit is actually several LED (Light Emitting Diode) chips mounted together on the same substrate, which is often ceramic or metal. LEDs are semiconductors that produce photons of light when electrons flow across a junction and fill &#;electron holes&#; on the other side.
COB manufacturers release data sheets for their products that dictate each unit&#;s specifications, as well as minimum, typical, and maximum values for a number of different variables. A sample of Cree&#;s data sheet for the CXB can be found here. A few examples of a COB&#;s characteristics that can be found in the data sheet include:
So, how do these little chips get mounted? Well, if there are screw holes in the board, you can screw them down, but the better alternative is always to get a holder, if possible.
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If you hate soldering or don&#;t have an iron, you&#;re in luck. Many COBs have matching holders that can be used to mount the COB to the heat sink and also offer a push-in connection for wiring to the COB terminals. The holders fit over top of the COB, and screw down into the heat sink, sandwiching the COB and forcing it to press tightly against the sink. Once it&#;s in place, you can simply push wire into the holder&#;s terminals (the white plastic pieces you see on the silver holders in the picture below), which press down on the corner contact points of the COB. Nice and simple!
If you want to focus your light more, you can add reflectors that attach to the front of the COBs (this often requires a separate adapter though). You can get reflectors in different angles, colors and materials, depending on what you need to accomplish. You can also attach glass lenses or diffusers to the reflectors to protect the COBs from dirt, water, and other garden gunk.
Despite being very energy-efficient, high-powered COB LEDs do dissipate a lot of power in the form of heat. If this heat builds, it can alter the COB&#;s characteristics and subsequently damage the unit, so it must be removed somehow. The sole purpose of heat sinks in a COB light system is to pull this heat away from the COBs and keep them running as cool as possible. Heat sinks are most often made of aluminum, which is a great conductor.
There are a number of different shapes of heat sinks, from the tested and true &#;fin&#; type, to the snazzy new &#;pin-fin&#; style. The purpose of all the fins, whether they&#;re rectangular or pins, is to increase the surface area of the heat sink as much as possible. More surface area makes it easier for heat to transfer from the COB, through the fins, and into the air.
Aside from the shape of the fins, there are 2 main types of heat sinks: active and passive.
Active heat sinks are those that use a fan to blow air over the fins to help remove the heat. If you use an actively cooled heat sink, you can get away with a much smaller unit than you could if you went passive. The risk with active cooling is that if the power supply running the fan were to ever die, the heat sink alone may not be able to cool the COB sufficiently.
Passive heat sinks are just chunks of metal and nothing else. As mentioned above, passive heat sinks must be much larger than their active counterparts in order to dissipate the same heat. What&#;s great about passive sinks is that you don&#;t have to worry about the fan dying and your COB overheating, as there are no moving parts.
If you were to try and mount your COB directly to your heat sink with nothing in between, you wouldn&#;t get very good contact between the two. When mounting to the heat sink, It&#;s imperative that 100% of the COB is making solid contact. Every minuscule pore and scratch that isn&#;t making contact is a spot that heat will build up and cause problems. For this reason, you need to use a thermal interface like a thermal pad, or thermal paste on the back of the COB to ensure the best connection possible.
LED drivers are the handy little boxes that take the power from your electrical outlet and convert it to a form that the COBs can use. The electricity coming from your outlet is alternating current (AC), and this does not work for COB LEDs &#; they require direct current (DC) instead.
LED drivers often come unterminated, which means you will have to wire an AC power plug to the end of the power cable (out of the box, it&#;s simply 3 bare wires). You will also need to terminate the positive and negative wires that connect to the COB LED circuit, as well as the 2 wires that control the dimming of the unit (some drivers come with a dimming knob built into the unit, but others simply come with 2 leads that you must attach a potentiometer to).
When purchasing an LED driver, you need to make sure that it is capable of producing enough power (in watts) to run all of your COBs. You also need to make sure it can produce this power at a certain current (in amps) and voltage (in volts). LED drivers come in 2 types: constant voltage drivers and constant current drivers. Constant voltage drivers hold their rated voltage steady and vary their current output, whereas constant current drivers hold their rated current steady, and vary their output voltage. C.V. drivers are typically used in parallel wired systems, while C.C. drivers are typically used in series wired systems.
If you&#;re new to LED, I&#;d suggest starting with constant current drivers as they are far easier to work with and are generally better-suited for most LED applications. Constant voltage drivers work wonderfully too, but can be trickier to set up and less forgiving if you mismatch the driver and COBs.
I would suggest reading these posts on selecting LED COBS and matching drivers, wiring LED COBs in series and parallel, and constant current vs. constant voltage drivers for a more detailed explanation.
This is the simplest part of the system &#; everyone has worked with wire in some capacity or another. You won&#;t need a lot of wire but you should definitely try to find the right stuff. You will need to connect all the COBs to one another and then connect the COBs back to the driver for power. See the post on wiring LED COBs in series and parallel for more information on how to hook up the COBs, and this post for help choosing wire for your system. In most cases, 18 gauge solid core cable should do the trick, but it&#;s best to check nonetheless.
Well, that&#;s it for the basics of a COB LED system! As always, you should definitely exercise caution when assembling these systems. It really helps to have some working knowledge of electricity, as there are certainly risks involved. I would suggest enlisting the help of a knowledgeable friend for the electrical stuff if it&#;s not your forte.
If you&#;re ready to get into the finer details, check out the DIY Guides section for a number of builds, articles, and calculators to help you build your own LED grow light.
If you&#;ve got a question, head on over to the forum and start a topic! Our community is happy to help, no matter what skill level you&#;re at.
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